CN103475027B - Wind farm and junction station time series coordination control method during concentrated wind power access - Google Patents
Wind farm and junction station time series coordination control method during concentrated wind power access Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to wind farm and junction station time series coordination control method during concentrated wind power access and belongs to the technical field of automatic voltage control of electrical power systems. According to the actual situation that most of wind power farms are accessed to a power grid through transformer substations, the time series coordination control of the wind farms and junction stations is adopted based on existing wind power control strategies and existing transformer substation control strategies, and accordingly the problems including reactive loop current, frequent capacitor switching and the like caused by isolated control are solved. The reactive power margin is increased, and accordingly the voltage stability of the electrical power systems is improved. The wind farm and junction station time series coordination control method acts on a secondary control plane of voltage control, and the shortcomings of the transformer substation and wind power farm isolated control in the original secondary control are made up.
Description
Technical field
The present invention relates to a kind of method that wind-powered electricity generation concentrates wind energy turbine set and load-center substation time series cooperation control in access region, belong to electric power system automatism voltage control technical field.
Background technology
Due to the shortage of coal resources, countries in the world are dropped into a large amount of human and material resources one after another and are explored new using energy source pattern, wind energy become universally acknowledged have tremendous expansion potentiality one of green energy resource.
The mode of current blower fan access electrical network has two kinds, one is by setting up wind energy turbine set, and field inner blower is concentrated on a large scale through transformer station and is incorporated to middle-voltage network, and another adopts distributed mode, by each blower fan access secondary network, power directly to terminal use.Wherein first kind of way can produce generated output that is concentrated, objective quantities, obtain large-scale application in the world, relatively successful story is Denmark, till now, wind power generation proportion is more than 20%, estimate at the year two thousand twenty, wind power generation can account for 50% and more than, the second way has good development prospect in intelligent distribution network.In China, mainly to concentrate grid-connected pattern on a large scale, although wind power generation has a lot of advantage, but still there are some technical problems and have to be solved in wind power generation.Wherein relatively outstanding be exactly many wind energy turbine set because of voltage problem chain off-grid, automatism voltage control (AVC, Automatic Voltage Control) system, is considered to effective ways of solution wind-powered electricity generation region voltage problem.
The automatism voltage control of main flow mainly contains Three models:
The first represents Two-stage control with German RWE Utilities Electric Co., do not have so-called zonal control, and the optimization result of calculation of optimal load flow (OPF) is directly dealt into each power plant and controls.In dispatching control center, OPF is based on state estimation, and real time execution, in the highest level of EMS, directly realizes considering to run the overall Reactive power control that constraint take loss minimization as target.Although this pattern controls simple, rely on OPF completely, the operational reliability of AVC is difficult to ensure.OPF is as static optimization computing function, and main consideration voltage bound retrains and loss minimization.If rely on OPF completely, then AVC is difficult to coordinate voltage stability, relies on OPF completely, cannot guarantee voltage stability.OPF model amount of calculation is large, and computing time is longer.When there is large disturbance in system, load being when skyrocketing or suddenly fall, if rely on OPF completely, then the response speed of AVC is inadequate, and the dynamic quality of control is difficult to ensure.
The second is the tertiary voltage control pattern with French EDF, and its research and enforcement start from the seventies in last century, and experienced by the research in more than 30 years, development and application, is be known as state-of-the-art voltage control system in the world at present.On international conference on large HV electric systems in 1972, from EDF(Electricite De France) engineer propose realize the voltage-controlled necessity of harmony in system scope, describe French EDF in detail with " maincenter bus ", the structure of the voltage control scheme based on " control area ", electrical network is divided into the control area of some decoupling zeros, whole control system is divided into three levels: voltage order one controls (PVC, Primary Voltage Control), secondary voltage control (SVC, Secondary Voltage Control) and tertiary voltage control (TVC, Tertiary Voltage Control).This control model obtains good application, but still there is shortcoming in this pattern, this is because the secondary voltage control in region (SVC) is developed based on the locality of power system reactive power voltage, and interregional reactive voltage has coupling, therefore the quality of control system is at the degree of coupling fundamentally depending on each interregional reactive power/voltage control.But, along with the development of electric power system and the real-time change of operating condition, think during design that the region of relative decoupling is not unalterable, and with the control sensitivity real-time change with operating condition especially that fixing controling parameters form exists, therefore this zone controller be fixed up in the form of hardware is difficult to adapt to the development of electric power system and the significantly change of real time execution operating mode, is therefore difficult to ensure good control effects enduringly.
The third is the tertiary voltage control pattern that Tsing-Hua University's department of electrical engineering dispatching automation laboratory proposes based on " soft sectoring ", this pattern is used widely in 16 nets, provincial power network at home, and is successfully generalized in the voltage control of North America PJM electrical network.Because area power grid itself has major network (220kV is to electrical network) loop-net operation, the feature that the radiation of 110kV electrical network runs, therefore area power grid has possessed natural graded properties, and this " subregion " is also the changes of operating modes along with electrical network.Therefore, the tertiary voltage control pattern based on soft sectoring is widely used.
Under normal conditions, wind energy turbine set region does not all have thermal power plant, and wind energy turbine set is mostly by 220kV load-center substation access electrical network, and in the aspect of Two-stage control, the main object participating in Two-stage control comprises wind energy turbine set and 220kV load-center substation.
For wind energy turbine set, general employing coordinated secondary voltage control (Coordinated Secondary Voltage Control, being called for short CSVC) model is (see " research of electric power system classification reactive voltage closed-loop control " (Guo Qing come, Tsing-Hua University's thesis for the doctorate, page number 57-64).Ensure that secondary voltage control follows the trail of the target of tertiary voltage control as far as possible, ensures enough idle territory degree on the other hand on the one hand.
For transformer station, its control device mainly takes into full account various on-the-spot service conditions and constraint barring condition, expert system based on control law carries out decision-making, generates transformer station's inner capacitor switching, load tap changer gear, static passive compensation device instruction.
It is Chinese the most common access way that wind energy turbine set accesses 220kV electrical network through transformer station.Blower fan set end voltage is generally 600V, boosts to after 35kV through the outside transmission of electric energy of primary substation through case change.Enter for the wind energy turbine set in wind-powered electricity generation region and 220kV transformer station, voltage control strategy can be provided respectively.But operationally wait; usually there will be some problems; in real system very well both process rapport and cause reactive apparatus frequently to drop into, the problem such as reactive circular power flow, jeopardize the voltage stabilization of electric power system, thus have influence on safety, the reliability service of whole electric power system further.
Summary of the invention
The object of the invention is for solving the problem, a kind of method of wind field and junction time series cooperation control when wind-powered electricity generation concentrates access is proposed, the two sequencing control relation can be handled well by the method, avoid the frequent switching of the reactive-load compensation equipments such as capacitor, while reaching voltage control target, avoid irrational idle flowing.
The method of wind field and junction time series cooperation control when a kind of wind-powered electricity generation that the present invention proposes concentrates access, is characterized in that, comprise the following steps:
1) control cycle starts, the voltage required for collection and idle electric parameters;
2) voltage correction is carried out:
2.1) judge that whether wind energy turbine set high voltage bus voltage is out-of-limit, if so, then turn to 2.2), otherwise turn to 2.3);
2.2) if wind field has idle control ability, priority acccess control wind field reactive apparatus is adopted to eliminate wind field voltage out-of-limit mode; If wind field does not have idle control ability, the 220kV load-center substation low-voltage reactive power equipment then adopting this wind field to connect is to eliminate wind field voltage out-of-limit mode, and by control estimate judge which can not cause other wind field high voltage bus voltage out-of-limits, to avoid the frequent switching of equipment; Judge that this which can cause other wind field high voltage bus voltage out-of-limits if control to estimate, then proceed to emergency control;
2.3) judge 220kV load-center substation high pressure 220kV bus or middle pressure 110kV bus whether out-of-limit, if out-of-limit, then priority acccess control 220kV stand in capacitor, reactor, eliminate voltage out-of-limit, turn to step 4); If do not have out-of-limit, turn to step 3);
3), after voltage correction, the control of voltage coordination optimization is carried out:
3.1) judge whether 220kV transformer station high pressure 220kV busbar voltage currency and set point deviation exceed optimal control dead band; If enter step 3.2), otherwise enter step 4);
3.2) if wind energy turbine set that this station is with still has Reactive-power control ability, then priority acccess control wind field reactive apparatus; As be with wind field without idle control ability, then control 220kV stand in capacitor, reactor; The target controlled is the 220kV busbar voltage set point making 220kV busbar voltage as far as possible meet current voltage feasible zone to provide; When control 220kV transformer station's reactive apparatus, aweather electric field controls module sends locking information, avoids the oscillation simultaneously controlling to cause;
4) station cooperation control terminates, and when waiting for that next control cycle arrives, goes to step 1).
Feature of the present invention and beneficial effect:
The inventive method is based on the actual conditions of most of wind energy turbine set by transformer station's access electrical network, on the basis of existing wind-powered electricity generation control strategy and Substation control strategy, add the time series cooperation control of the two, thus solve the isolated problem such as reactive circular power flow, capacitor frequent switching controlling to cause, add idle territory degree, thus improve Power System Voltage Stability.This cooperative control method acts on voltage-controlled Two-stage control aspect, compensate for transformer station and wind energy turbine set in original Two-stage control and isolates the deficiency of control.
Accompanying drawing explanation
Fig. 1 is the flow chart of wind energy turbine set of the present invention and transformer station's time series cooperation control.
Fig. 2 is the wind energy turbine set online schematic diagram of the embodiment of the present invention.
Embodiment
Methods combining accompanying drawing and a specific embodiment are described in detail as follows:
Fig. 2 is a typical wind energy turbine set online schematic diagram, wind energy turbine set inner blower accesses wind farm side 35kV high voltage bus after step-up transformer, afterwards in 220kV load-center substation access 220kV electrical network, idle, voltage control apparatus is all had in wind energy turbine set He in 220kV load-center substation, as first-class in Capacitor banks, static reacance generator, transformer tap.In 220kV load-center substation, generally there are 220/35kV two winding transformer or 220/110/35kV three-winding transformer or there is the two simultaneously.
The method of the present embodiment comprises the following steps: the general setup control cycle is 5-10 minute, and the present embodiment setup control cycle is 5 minutes;
1) control cycle starts, and gathers the 220kV load-center substation high voltage side of transformer winding voltage of wind energy turbine set bus and the connection of wind-powered electricity generation place, wind energy turbine set surfs the Net idle electric parameters.
2) voltage correction is carried out;
2.1) judge that whether wind energy turbine set high voltage bus voltage is out-of-limit and (out-of-limitly refer to voltage higher than the voltage of place electric pressure or upper limit person lower than lower voltage limit, suppose in the present embodiment that place electric pressure is VBase, then corresponding upper voltage limit 1.05Vbase, lower voltage limit is 0.95VBase), if, then turn to 2.2), otherwise turn to 2.3);
2.2) if wind field has idle control ability, priority acccess control wind field reactive apparatus is eliminated wind field voltage out-of-limit and (if Over High-Limit Voltage, is then excised Capacitor banks, if having static reacance generator, then reduce it and export perceptual idle; If voltage gets over lower limit, then drop into more Capacitor banks, if having static reacance generator, then increase it and export perceptual idle); If wind field does not have idle control ability, the 220kV load-center substation low-voltage reactive power equipment then using this wind field to connect is to eliminate wind field voltage out-of-limit (if Over High-Limit Voltage, then excise Capacitor banks, if having static reacance generator, then reduce it and export perceptual idle; If voltage gets over lower limit, then drop into more Capacitor banks, if having static reacance generator, then increase it and export perceptual idle; If possess band to carry adjustable transformer, then load tap changer can be controlled; Below how no longer concrete elaboration eliminates wind field voltage out-of-limit by reactive apparatus); When using 220kV transformer station low-voltage reactive power equipment to eliminate the out-of-limit mode of wind energy turbine set high voltage bus, judging which can not cause other wind field high voltage bus voltage out-of-limits by controlling to estimate, avoiding the frequent switching of equipment; If estimated by control and judge which can cause other wind field high voltage bus voltage out-of-limits, then start the emergency control module in automatism voltage control (AVC), carry out emergency control;
2.3) judge 220kV transformer station high pressure 220kV bus or middle pressure 110kV bus whether out-of-limit, if out-of-limit, then priority acccess control 220kV stand in capacitor, reactor, eliminate voltage out-of-limit, turn to step 4); If do not have out-of-limit, turn to step 3);
3), after voltage correction, the control of voltage coordination optimization is carried out:
3.1) judge whether 220kV transformer station high pressure 220kV busbar voltage currency and set point deviation exceed optimal control dead band; If enter step 3.2), otherwise enter step 4);
3.2) if wind energy turbine set that this station is with still has idle control ability, then priority acccess control wind field reactive apparatus; As be with wind field without idle control ability, then control 220kV stand in capacitor, reactor; The target of optimal control is the 220kV busbar voltage set point making 220kV busbar voltage as far as possible meet current voltage feasible zone to provide; When control 220kV transformer station's reactive apparatus, aweather electric field controls module sends locking information, avoids the oscillation simultaneously controlling to cause;
4) station cooperation control terminates, and when waiting for that next control cycle arrives, goes to step 1).
Claims (1)
1. a method for wind field and junction time series cooperation control when wind-powered electricity generation concentrates access, is characterized in that, comprise the following steps:
1) control cycle starts, the voltage required for collection and idle electric parameters;
2) voltage correction is carried out:
2.1) judge that whether wind energy turbine set high voltage bus voltage is out-of-limit, if so, then turn to 2.2), otherwise turn to 2.3);
2.2) if wind field has idle control ability, priority acccess control wind field reactive apparatus is adopted to eliminate wind field voltage out-of-limit mode; If wind field does not have idle control ability, the 220kV load-center substation low-voltage reactive power equipment then adopting this wind field to connect is to eliminate wind field voltage out-of-limit mode, and judge that this priority acccess control wind field reactive apparatus is eliminated the 220kV load-center substation low-voltage reactive power equipment that wind field voltage out-of-limit mode or this wind field connect and eliminated wind field voltage out-of-limit mode by controlling to estimate, other wind field high voltage bus voltage out-of-limits can not be caused, to avoid the frequent switching of equipment; Judge that this priority acccess control wind field reactive apparatus is to the 220kV load-center substation low-voltage reactive power equipment eliminated wind field voltage out-of-limit mode or this wind field and connect to eliminate wind field voltage out-of-limit mode if control to estimate, other wind field high voltage bus voltage out-of-limits can be caused, then proceed to emergency control;
2.3) judge 220kV load-center substation high pressure 220kV bus or middle pressure 110kV bus whether out-of-limit, if out-of-limit, then capacitor, reactor in priority acccess control 220kV load-center substation, eliminate voltage out-of-limit, turn to step 4); If do not have out-of-limit, turn to step 3);
3), after voltage correction, the control of voltage coordination optimization is carried out:
3.1) judge whether 220kV load-center substation high pressure 220kV busbar voltage currency and set point deviation exceed optimal control dead band; If enter step 3.2), otherwise enter step 4);
3.2) if wind energy turbine set that this station is with still has Reactive-power control ability, then priority acccess control wind field reactive apparatus; As be with wind field without idle control ability, then capacitor, reactor in control 220kV load-center substation; The target controlled is the 220kV busbar voltage set point making 220kV busbar voltage as far as possible meet current voltage feasible zone to provide; When control 220kV load-center substation reactive apparatus, aweather electric field controls module sends locking information, avoids the oscillation simultaneously controlling to cause;
4) station cooperation control terminates, and when waiting for that next control cycle arrives, goes to step 1).
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| CN105162174B (en) * | 2015-09-06 | 2016-10-05 | 贵州电网有限责任公司 | A kind of wind power supply net control method for coordinating based on active indicator of distribution and system |
| CN106208152B (en) * | 2016-07-20 | 2018-08-03 | 国家电网公司 | A kind of automatic voltage control method of wind fire collaboration |
| CN106684881A (en) * | 2016-11-28 | 2017-05-17 | 国家电网公司 | Bus voltage regulating method and device used in district dispatching AVC system |
| CN107294088B (en) * | 2017-06-28 | 2023-08-01 | 中国能源建设集团甘肃省电力设计院有限公司 | Incremental power distribution network construction application method for electric power change and multi-power direct power supply system |
| CN107809114A (en) * | 2017-09-20 | 2018-03-16 | 国家电网公司 | Line voltage Automatic adjustment method |
| CN110970902A (en) * | 2018-12-20 | 2020-04-07 | 国网上海市电力公司 | Voltage partition automatic reactive power optimization control method based on new energy access requirement |
| CN110649633B (en) * | 2019-09-26 | 2021-01-15 | 广西宏湖水利电业科技发展有限公司 | Power distribution network reactive power optimization method and system |
| CN111799809B (en) * | 2020-06-30 | 2023-10-13 | 云南电网有限责任公司电力科学研究院 | Method for cooperatively controlling voltage by SVG and doubly-fed induction wind turbine |
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